[Adopted 8-1-1927 by Ord. No. 272, approved 8-2-1927]
The Mayor and Borough Council of the Borough of Darby does ordain that the sidewalks on Main Street in the Borough of Darby aforesaid, from Cobbs Creek to the boundary between said Borough and the Borough of Yeadon, shall be paved for the full width from building line to the curbline as said lines now are or hereafter may be established.
The sidewalks on all other streets, avenues or highways of said Borough shall be paved to the width of five feet. Said paving shall be laid so that the outer edge shall be three feet from the curbline where the sidewalk is eight feet or more in width, and shall be laid adjoining the building line where the sidewalk is eight feet or less in width.
All sidewalks hereafter laid or relaid by the Borough upon failure of any property owner to do the work, as hereinafter prescribed, shall be constructed as follows:
A. 
Concrete. All sidewalks shall be constructed of one course of concrete. This course shall be four inches in thickness, composed of one part portland cement, two parts of fine aggregate and four parts of coarse aggregate, constructed in accordance with the plans and in conformity with these specifications.
B. 
Portland cement. Portland cement shall meet the requirements of the current Standard Specifications and Tests for Portland Cement adopted by the American Society for Testing Materials (Serial No. C 9-26).
C. 
Fine aggregate. Fine aggregate shall consist of sand having hard, strong, durable grains and shall be free from injurious amounts of dust, lump, soft or flaky particles and shale. It shall be free from alkali and surface coatings and shall not contain injurious amounts of vegetable or other organic matter as determined by the colorimetric test described in the Tentative Method of Test for Organic Impurities of the American Society for Testing Materials (Serial No. C 40-21). Fine aggregate shall range in size from fine to coarse, preferably within the following limits:
(1) 
Passing through No. 4 sieve, not less than 85%.
(2) 
Passing through No. 50 sieve, not more than 30%.
D. 
Mortar strength test. Fine aggregate shall be of such quality that mortar composed of one part of portland cement and three parts of fine aggregate by weight, when made in briquettes, shall show a tensile strength at seven and 28 days at least equal to the strength of briquettes composed of one part of the same cement and three parts of Standard Ottawa sand by weight. The percentage of water used in making the briquettes of cement and fine aggregate shall be such as to produce a mortar of the same consistency as that of the Ottawa sand briquettes of standard consistency. In other respects, briquettes shall be made in accordance with the method of testing cement recommended by the American Society for Testing Materials (Serial No. C 9-21).
E. 
Coarse aggregate.
(1) 
Coarse aggregate shall consist of crushed stone or air-cooled blast furnace slag having hard, strong, durable particles, free from injurious amounts of soft, friable, thin, elongated or laminated pieces, alkali or organic or other harmful matter.
(2) 
All coarse aggregate shall pass a one-inch screen and 95% shall be retained on a one-fourth-inch screen.
(3) 
Broken slag shall consist of roughly cubical fragments of air-cooled blast furnace slag. It shall be reasonably uniform in density and quality. The weight of slag when shaken to refusal shall be at least 70 pounds per cubic foot, and it shall be reasonably free from metallic iron and contain no dirt or other objectionable matter.
F. 
Water. Water shall be clear and free from oil, acid, alkali, organic matter or other deleterious substances. It shall preferably be equal in all physical and chemical properties to potable water.
G. 
Grade. The forms shall be set to a grade having a rise of 1/4 of an inch to the foot above and at right angles to the top of the curb.
H. 
Forms. Outside forms shall be of wood or metal of the depth of the concrete and shall be straight, free from warp and of sufficient strength when staked to resist the pressure of the concrete without springing. If of wood, they shall be of a two-inch approved section, or if of metal, they shall be of approved section and shall have a flat surface on top of no less than 1 3/4 inches. The forms shall be joined neatly and tightly and staked securely to line and grade and shall be cleaned thoroughly and greased or scraped before any concrete is placed against them.
I. 
Joint filler. The filler to be used in the transverse joints in the pavement shall consist of an approved prepared tar or asphalt filler having a thickness of 1/2 inch and a depth of not less than one inch more than the depth of the pavement.
J. 
Excavations. Excavations shall be made in the proper dimensions and elevation, making necessary allowance for forms and other operations required to complete the concrete work. All soft and spongy material shall be removed and replaced with suitable firm material, which shall be compacted to conform in contour and firmness to the surrounding subgrade material.
K. 
Expansion joints. Expansion joints shall be placed approximately 50 feet apart and shall be formed during the placing of the concrete by securely staking an iron bulkhead on lines specified for slab joints. The prepared joint filler shall be placed against the bulkhead before the concrete is deposited against it.
L. 
Slab joints. The slabs or independently divided blocks shall have an area of 25 square feet. The block divisions shall extend through the entire thickness of the slab, and they shall be made in a straight line at right angles to the edges of the slab on tangent and on radial lines where the pavement is laid on a curve. Cross plates shall be of iron not less than 1/8 inch in thickness and five inches in depth and shall be placed where the block divisions are to be made.
M. 
Measuring.
(1) 
All materials shall be accurately measured by volume. The cement shall be measured as packed by the manufacturer, a sack containing not less than 94 pounds being considered one cubic foot. Fine and coarse aggregate shall be measured loose.
(2) 
The contractor shall furnish and use an approved water measuring and discharging device, also boxes of such dimensions as will give, when filled and struck, the exact volume of aggregate required for the concrete specified.
N. 
Mixing.
(1) 
All concrete shall be mixed in a batch mixer of an approved type. The volume of the mixed material used per batch shall not exceed the manufacturer's rated capacity of the drum in cubic feet of mixed material. Only enough concrete shall be mixed that will be placed within 45 minutes.
(2) 
The ingredients of the concrete shall be mixed to the specified consistency. No materials shall be permitted to enter the drum until all the preceding batch has been discharged. The time of mixing shall be from the time all materials, including the water, are in the mixer and before any part of the batch is discharged. The time of mixing shall be not less than 1 1/4 minutes. No concrete shall be mixed while the air temperature is at or below 35° F.
O. 
Retempering. Retempering of concrete which has partially hardened, that is, remixing with additional water, shall not be permitted.
P. 
Placing and finishing.
(1) 
Concrete shall be placed immediately after mixing. It shall be tamped and struck off with a template and shall be floated with a wooden float until the surface has a true contour. Care shall be taken to not bring to the surface an excess of water and fine sand by overfinishing.
(2) 
All joints shall be edged to a radius of 1/8 of an inch. The surface edges of each slab shall be rounded to a radius of about 1/4 of an inch.
Q. 
Protection. The finished pavement shall be protected from the hot sun, rain, high winds, frost and trespassers for at least 24 hours after the concrete is placed and as much longer thereafter as may be required.
All sidewalks hereafter laid or relaid by any property owner, either without notice or in compliance with a notice from the Borough, shall be laid and constructed in accordance with § 125-3 hereof, or said property owner, at his or her option, may construct said sidewalks of bricks, in which case said bricks shall be laid in a bed of two inches of sharp sand upon a foundation of six inches of coal cinders, well rammed, all joints to be properly broken. The outer row of bricks on each side shall be set on edge, flush with the surface of the sidewalk.
The specifications for curbing shall conform to the specifications for sidewalks except as herein provided. All curbs on said streets constructed by the Borough shall be constructed of hard bluestone or granite not less than four feet long, four inches thick and set not less than 20 inches deep, or of cement concrete in accordance with the following specifications:
A. 
Concrete. All curbing shall consist of concrete composed of one part of portland cement, two parts of fine aggregate and four parts of coarse aggregate. It shall be 24 inches in depth, six inches in width at the top and seven inches in width at the bottom. It shall have a batter of one inch from the top of the curbing to the surface of the gutter.
B. 
Coarse aggregate. Coarse aggregate shall consist of 3/4 inch crushed stone having hard, strong, durable particles, free from injurious amounts of soft, friable, thin, elongated or laminated pieces, alkali or organic or other harmful matter.
C. 
Forming joints. The curbing shall be constructed in uniform lengths or sections of 10 feet, except where shorter sections are necessary for closures, but no section shall be less than four feet. These sections shall be separated by sheet steel templates set perpendicular to the face and top of the curbing. These templates shall be 1/8 of an inch in thickness, of the width of the curbing and not less than two inches longer than the depth of the curbing. The templates shall be set carefully during the placing of concrete and allowed to remain in place wherever possible until the concrete has set sufficiently to hold its shape, but shall be removed while the forms are still in place.
D. 
Expansion joints. Expansion joints shall be placed approximately 50 feet apart. They shall be 1/2 inch in width and composed of a suitable material that will not become soft and run in hot weather or become brittle in cold weather.
E. 
Finishing. The curbing shall be spaded sufficiently to obtain a smooth, even finish. The edge of the face shall be rounded to a radius of not more than 3/4 of an inch while the concrete is still soft. The forms shall be removed within 24 hours after the concrete has been placed. Minor defects shall be filled with mortar composed of one part of portland cement and two parts of fine aggregate, which shall be applied with a wooden float. Plastering shall not be permitted. The top and face of the curbing from the top to eight inches below shall be finished while the concrete is still green by frequently wetting a soft brick or a wood block and rubbing the surface until it is smooth. After the concrete has been rubbed smooth, it shall be rubbed again until a uniform color is produced, using in place of water a thin grout composed of one part of portland cement and one part of approved sand.
All gutters shall extend to a width of three feet from the curbline and shall be constructed of vitrified block set on edge and laid in a bed of sharp sand one inch deep upon a concrete base five inches deep, or of bituminous or cement concrete in accordance with the following specifications:
A. 
Where the gutters are constructed of bituminous concrete, they shall be built of the same material and under the same specifications as the balance of the roadway.
B. 
All cement concrete gutters shall consist of concrete composed of one part portland cement, two parts of fine aggregate and three parts of coarse aggregate. They shall be 36 inches in width and six inches in depth, mixed and placed in accordance with the specifications for sidewalks.
C. 
Specifications for coarse aggregate, forming joints and expansion joints shall conform to the specifications provided for curbing.
Said pavements and curbs shall be constructed according to lines and grades to be furnished by the Borough Engineer, and the work shall be done to the satisfaction of the Sidewalk Committee of the Council of the Borough of Darby.
The construction and repair of said sidewalks, curbs and gutters shall be done by the owner or owners of lots fronting upon the street, avenue or highway upon which such construction or repair is to be made.
If any owner or owners of any lot or lots fronting upon such street, avenue or highway shall fail to construct or repair any sidewalk, curb or gutter within 30 days after notice to make such construction or repair is served upon such owner or owners by the Mayor or the Sidewalk Committee of said Borough, then said Borough shall have said construction or repair done, and the cost thereof plus 10% additional, together with all charges and expenses, shall be collected from said owner by municipal claim or action in assumpsit as prescribed by Act of Assembly.
All notices requiring the construction or repair of sidewalks, curbs or gutters shall be in writing and shall be served upon the owner of the premises if such owner is a resident of said Borough. If the owner is not a resident of said Borough, then the notice may be served upon the agent or tenant of the owner residing in the Borough or upon the occupant of the premises. If the owner is not a resident and has no known agent residing in said Borough, or there is no tenant or occupier of said premises, then service shall be by printed or written notice posted upon the premises.